In our reasonings concerning matter of fact， there are all imaginable degrees of assurance， from the highest certainty to the lowest species of moral evidence.

数学中最深刻的思想往往源于最简单的观察。

我经常锻炼。只是昨天我是在床上吃的早饭。

Contemplating the weaknesses of others is easy； contemplating the weaknesses in yourself is hard， but it pays a much higher reward.

A building is not just a place to be, but a way to see.

过去是人第一；未来必须是系统第一。